The figure was standing by the river at the rear of the Grosvenor Casino on Moat Street, Chandlers Wharf, Stockton.

Two people are seen on walk by in the direction of Castlegate Quay and police would again appeal to try to trace these people, as it is believed that they may be able to assist police with their inquiries.

Detective Inspector Glen Westmoreland said: “We remain extremely concerned for David and we will continue with our enquiries to trace him.

“His family have endured a difficult Christmas not knowing where he is.

David Welsh was last seen on Tower Street

“As part of our enquiries we have recently appealed to anyone that may have seen someone close to the river at the river of Grosvenor Casino at 8.05pm on the night that he went missing. It is unconfirmed as to whether that person was David,

“however, we know that two people did walk past at that time. I’d like to appeal to those two people and to anyone else who thinks that they may have seen David since the night that he went missing to contact police.”